Industrial Ethernet Connectivity Solution — Allen-Bradley 1785-ENET | PLC-5 Series
The Allen-Bradley 1785-ENET Ethernet Interface Module delivers robust TCP/IP network connectivity to legacy PLC-5 programmable controller systems. Designed for engineers who need to integrate proven PLC-5 infrastructure into modern Ethernet-based plant networks without full system replacement, this module bridges the gap between established control logic and contemporary SCADA, HMI, and MES architectures.
Where This Product Is Used
The 1785-ENET is specified across a wide range of industrial environments where PLC-5 controllers remain the backbone of production operations:
- Automotive Manufacturing — Body-in-white assembly lines and paint shop conveyors running PLC-5 logic require Ethernet uplinks to plant-floor MES systems for real-time production tracking.
- Oil & Gas Processing — Upstream pump stations and midstream compressor control panels use the 1785-ENET to feed process data to SCADA platforms over TCP/IP without disrupting proven control programs.
- Water & Wastewater Treatment — Municipal lift stations and filtration facilities leverage this module to connect aging PLC-5 assets to centralized monitoring dashboards.
- Pulp & Paper Mills — High-availability continuous-process environments where replacing the PLC-5 controller is not an option; Ethernet integration extends asset life by 5–10 years.
- Food & Beverage Processing — Batch control systems requiring OEE data collection from PLC-5 controllers via EtherNet/IP or TCP/IP messaging to historian servers.
- Mining & Minerals — Conveyor drive control and crusher automation panels in remote sites where PLC-5 reliability is non-negotiable and Ethernet backhaul is the only viable communications path.
Technical Specifications
| Part Number | 1785-ENET |
| Manufacturer | Allen-Bradley / Rockwell Automation |
| Compatible Controllers | PLC-5 Family (1785 series) |
| Network Protocol | EtherNet/IP, TCP/IP, UDP |
| Data Rate | 10 Mbps (10BASE-T) |
| Connector Type | RJ-45 |
| Backplane Interface | PLC-5 1771 I/O chassis backplane |
| Messaging Support | PCCC (DF1), CIP Messaging |
| IP Address Configuration | BOOTP / Static |
| Operating Temperature | 0 °C to 60 °C (32 °F to 140 °F) |
| Storage Temperature | -40 °C to 85 °C |
| Relative Humidity | 5% to 95% non-condensing |
| Power Consumption | Supplied via 1771 backplane |
| Weight | 960 g (approx.) |
| Agency Certifications | UL, CE, CSA |
Why Engineers Specify This Model
- Non-disruptive integration — Adds Ethernet capability to an existing PLC-5 chassis without modifying the control program or replacing the processor, preserving validated logic and minimizing downtime risk.
- Dual-protocol support — Handles both legacy PCCC/DF1 messaging and modern CIP, allowing simultaneous communication with older HMI panels and new SCADA servers on the same network segment.
- Proven field reliability — Deployed in thousands of installations globally across harsh industrial environments; mean time between failures (MTBF) data supports long-term asset planning.
- Cost-effective life extension — Extending a PLC-5 system’s network capability costs a fraction of a full controller migration project, deferring capital expenditure while maintaining production continuity.
- Simplified commissioning — BOOTP-based IP address assignment and RSLinx Classic driver support reduce network configuration time to under 30 minutes for experienced technicians.
Complete System Bill of Materials
A typical PLC-5 Ethernet integration project using the 1785-ENET includes the following components:
- 1785-ENET — Ethernet Interface Module (this item)
- 1785-L series — PLC-5 Processor (1785-L20, L40, L60, L80 depending on I/O count)
- 1771-A series — 1771 I/O Chassis (A1B, A2B, A3B1, A4B)
- 1771-P4S / 1771-P7 — Chassis Power Supply
- 1784-PCMK or 1784-U2DHP — Programming Cable / USB-to-DH+ Adapter
- RSLogix 5 (Studio 5000 not required) — Programming Software
- RSLinx Classic — OPC/DDE Communication Driver
- Industrial Ethernet Switch (unmanaged or managed, DIN-rail mount recommended)
- CAT5e / CAT6 shielded patch cable — RJ-45, appropriate length
Compliance & Industry Standards
- UL Listed — Underwriters Laboratories industrial control equipment standard
- CE Marked — Compliant with EU Low Voltage Directive and EMC Directive
- CSA Certified — Canadian Standards Association approval for industrial use
- EtherNet/IP Conformance — ODVA-conformant EtherNet/IP implementation
- RoHS Compliant — Restriction of Hazardous Substances (verify with specific production date code)
- IEC 61131 — Compatible with IEC 61131-3 structured programming environments via RSLogix 5
Quality Assurance & Sourcing
Konmask.com sources the 1785-ENET through verified industrial automation distributors and authorized surplus channels. Every unit offered undergoes the following before dispatch:
- Visual inspection — Connector integrity, PCB condition, label legibility, and housing checked against OEM reference standards.
- Functional power-on test — Module is seated in a compatible 1771 chassis and powered to confirm backplane communication and LED status indicators respond correctly.
- Firmware version documentation — Firmware revision recorded and disclosed; customers requiring a specific revision should confirm prior to order.
- Anti-static packaging — Shipped in ESD-safe bags with foam cushioning inside double-wall corrugated cartons.
- Traceability — Date code and serial number logged against each order for post-sale reference.
How to Source This Part
- Confirm compatibility — Verify your PLC-5 processor model (1785-Lxx) and chassis series (1771-Axx) support the 1785-ENET. Consult Rockwell Publication 1785-UM012 for slot placement rules.
- Check quantity & lead time — Contact us at support@konmask.com or +0086 19859288691 for real-time stock confirmation and bulk pricing.
- Place your order — Add to cart and proceed to checkout. We accept T/T bank transfer, PayPal, and major credit cards. Net-30 terms available for qualified accounts.
- Receive & commission — Units ship within 1–3 business days. Include your RSLinx Classic version when requesting commissioning support.
Application-Specific FAQ
Q: Can the 1785-ENET communicate with a ControlLogix or CompactLogix controller on the same Ethernet network?
A: Yes. Using CIP messaging (MSG instruction) configured for Ethernet/IP, a ControlLogix controller can read/write data to a PLC-5 via the 1785-ENET using PCCC-encapsulated CIP messages. This is a common integration pattern during phased migration projects.
Q: Does the 1785-ENET support 100 Mbps Fast Ethernet?
A: No. The 1785-ENET operates at 10 Mbps (10BASE-T) only. Modern managed switches auto-negotiate to 10 Mbps on the port connected to this module. This is sufficient for PLC-5 data throughput requirements in most applications.
Q: How many simultaneous TCP connections does the module support?
A: The 1785-ENET supports up to 64 simultaneous TCP connections, adequate for multi-client SCADA, HMI, and historian access in typical plant architectures.
Q: Can I use this module with RSLogix 5000 / Studio 5000?
A: No. PLC-5 programming requires RSLogix 5. Studio 5000 / RSLogix 5000 is for Logix5000-family controllers (ControlLogix, CompactLogix). RSLinx Classic is required as the communication driver for both programming and runtime data access.
Q: Is a replacement or refurbished unit covered by warranty?
A: Konmask.com provides a 90-day functional warranty on all tested units. Extended warranty options are available — contact us for details.
Q: What is the lead time for bulk orders (10+ units)?
A: Lead times for bulk quantities vary by current stock. Contact support@konmask.com with your required quantity and delivery date for a committed schedule.
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Contact: support@konmask.com | +0086 19859288691
